TABLE 32 MINIMUM BREAKING FORCE
OF
WIRE
ROPE
19 x 7 ConstructionIRotation Resistant/Bright (Uncoated)
Nominal Diameter Approximate Mass
Minimum
Breaking
Force*
Improved
Extra Improved
Plow Steel** Plow Steel**
inches
mm
Ib/ft
kg/m
tons metric tonnes tons
metric tonnes
112
12.7 0.45 0.67
9.85
8.94
10.8
9.8
9/16
14.3
0.58 0.86 12.4 11.2 13.6
12.3
5/8
15.9 0.71
1.06 15.3 13.9 16.8
15.2
3/4
19.1 1.02 1.52
21.8 19.8
24.0 21.8
7/8
22.2
1.39 2.07 29.5 26.8 32.5 29.5
1 25.4
1.82 2.71 38.3 34.7 42.2 38.3
1-1/8
28.6
2.30
3.42 48.2
43.7
53.1
48.2
1-114
31.8 2.84
4.23
59.2
53.7 65.1 59.1
1-3/8
34.9
3.43 5.10
71.3 64.7
78.4 71.1
1-1/2
38.1 4.08 6.07
84.4 76.6 92.8
84.2
The given strengths are applicable only when a test is conducted on a new rope fixed at both ends. When the rope
is
in
use, the breaking strength is reduced when one end
is
free to rotate.
*
To convert to Kilonewtons
(kN),
multiply tons (minimum breaking force) by 8.896;
1 lb
= 4.448 newtons (N).
**
Minimum breaking forces listed above apply to ropes with bright
or
drawn galvanized wires. Minimum breaking
forces are 10% lower for ropes with wires galvanized at finish size.
Wire Rope Technical Board - Wire Rope Users Manual, Fourth Edition
-107
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